/*=========================================================================

  Program:   ParaView
  Module:    vtkCommandOptions.cxx

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkCommandOptions.h"
#include "vtkCommandOptionsXMLParser.h"
#include "vtkObjectFactory.h"

#include <sstream>
#include <string>
#include <vtksys/CommandLineArguments.hxx>
#include <vtksys/SystemTools.hxx>

//----------------------------------------------------------------------------
//****************************************************************************
class vtkCommandOptionsInternal
{
public:
  vtksys::CommandLineArguments CMD;
};
//****************************************************************************
//----------------------------------------------------------------------------

//----------------------------------------------------------------------------
vtkStandardNewMacro(vtkCommandOptions);

//----------------------------------------------------------------------------
vtkCommandOptions::vtkCommandOptions()
{
  this->ProcessType = EVERYBODY;
  // Initialize vtksys::CommandLineArguments
  this->Internals = new vtkCommandOptionsInternal();
  this->Internals->CMD.SetUnknownArgumentCallback(vtkCommandOptions::UnknownArgumentHandler);
  this->Internals->CMD.SetClientData(this);
  this->UnknownArgument = nullptr;
  this->HelpSelected = 0;

  this->ErrorMessage = nullptr;
  this->Argc = 0;
  this->Argv = nullptr;
  this->ApplicationPath = nullptr;

  this->XMLConfigFile = nullptr;

  this->XMLParser = vtkCommandOptionsXMLParser::New();
  this->XMLParser->SetPVOptions(this);
}

//----------------------------------------------------------------------------
vtkCommandOptions::~vtkCommandOptions()
{
  this->SetXMLConfigFile(nullptr);

  // Remove internals
  this->SetUnknownArgument(nullptr);
  this->SetErrorMessage(nullptr);
  this->CleanArgcArgv();
  delete this->Internals;

  this->SetApplicationPath(nullptr);

  if (this->XMLParser)
  {
    this->XMLParser->Delete();
    this->XMLParser = nullptr;
  }
}

//----------------------------------------------------------------------------
const char* vtkCommandOptions::GetHelp()
{
  int width = vtksys::SystemTools::GetTerminalWidth();
  if (width < 9)
  {
    width = 80;
  }

  this->Internals->CMD.SetLineLength(width);
  this->Internals->CMD.SetLineLength(300);

  return this->Internals->CMD.GetHelp();
}

//----------------------------------------------------------------------------
void vtkCommandOptions::Initialize()
{
}

//----------------------------------------------------------------------------
int vtkCommandOptions::PostProcess(int, const char* const*)
{
  return 1;
}

//----------------------------------------------------------------------------
int vtkCommandOptions::WrongArgument(const char* argument)
{
  // if the unknown file is a config file then it is OK
  if (this->XMLConfigFile && strcmp(argument, this->XMLConfigFile) == 0)
  {
    // if the UnknownArgument is the XMLConfigFile then set the
    // UnknownArgument to nullptr as it really is not Unknown anymore.
    if (this->UnknownArgument && (strcmp(this->UnknownArgument, this->XMLConfigFile) == 0))
    {
      this->SetUnknownArgument(nullptr);
    }
    return 1;
  }

  return 0;
}

//----------------------------------------------------------------------------
const char* vtkCommandOptions::GetArgv0()
{
  return this->Internals->CMD.GetArgv0();
}

//----------------------------------------------------------------------------
int vtkCommandOptions::LoadXMLConfigFile(const char* fname)
{
  this->XMLParser->SetFileName(fname);
  this->XMLParser->Parse();
  this->SetXMLConfigFile(fname);
  return 1;
}

//----------------------------------------------------------------------------
int vtkCommandOptions::Parse(int argc, const char* const argv[])
{
  this->Internals->CMD.Initialize(argc, argv);
  this->Initialize();
  this->AddBooleanArgument("--help", "/?", &this->HelpSelected,
    "Displays available command line arguments.", vtkCommandOptions::EVERYBODY);

  // First get options from the xml file
  for (int i = 0; i < argc; ++i)
  {
    std::string arg = argv[i];
    if (arg.size() > 4 && arg.find(".pvx") == (arg.size() - 4))
    {
      if (!this->LoadXMLConfigFile(arg.c_str()))
      {
        return 0;
      }
    }
  }
  // now get options from the command line
  int res1 = this->Internals->CMD.Parse();
  int res2 = this->PostProcess(argc, argv);
  // cout << "Res1: " << res1 << " Res2: " << res2 << endl;
  this->CleanArgcArgv();
  this->Internals->CMD.GetRemainingArguments(&this->Argc, &this->Argv);
  this->ComputeApplicationPath();

  return res1 && res2;
}

//----------------------------------------------------------------------------
void vtkCommandOptions::CleanArgcArgv()
{
  int cc;
  if (this->Argv)
  {
    for (cc = 0; cc < this->Argc; cc++)
    {
      delete[] this->Argv[cc];
    }
    delete[] this->Argv;
    this->Argv = nullptr;
  }
}
//----------------------------------------------------------------------------
void vtkCommandOptions::AddDeprecatedArgument(
  const char* longarg, const char* shortarg, const char* help, int type)
{
  // if it is for xml or not for the current process do nothing
  if ((type & XMLONLY) || !(type & this->ProcessType || type == vtkCommandOptions::EVERYBODY))
  {
    return;
  }
  // Add a callback for the deprecated argument handling
  this->Internals->CMD.AddCallback(longarg, vtksys::CommandLineArguments::NO_ARGUMENT,
    vtkCommandOptions::DeprecatedArgumentHandler, this, help);
  if (shortarg)
  {
    this->Internals->CMD.AddCallback(shortarg, vtksys::CommandLineArguments::NO_ARGUMENT,
      vtkCommandOptions::DeprecatedArgumentHandler, this, help);
  }
}

//----------------------------------------------------------------------------
int vtkCommandOptions::DeprecatedArgument(const char* argument)
{
  std::ostringstream str;
  str << "  " << this->Internals->CMD.GetHelp(argument);
  str << ends;
  this->SetErrorMessage(str.str().c_str());
  return 0;
}

//----------------------------------------------------------------------------
void vtkCommandOptions::AddBooleanArgument(
  const char* longarg, const char* shortarg, int* var, const char* help, int type)
{
  // add the argument to the XML parser
  this->XMLParser->AddBooleanArgument(longarg, var, type);
  if (type & XMLONLY)
  {
    return;
  }
  // if the process type matches then add the argument to the command line
  if (type & this->ProcessType || type == vtkCommandOptions::EVERYBODY)
  {
    this->Internals->CMD.AddBooleanArgument(longarg, var, help);
    if (shortarg)
    {
      this->Internals->CMD.AddBooleanArgument(shortarg, var, longarg);
    }
  }
}

//----------------------------------------------------------------------------
void vtkCommandOptions::AddArgument(
  const char* longarg, const char* shortarg, int* var, const char* help, int type)
{
  this->XMLParser->AddArgument(longarg, var, type);
  if (type & XMLONLY)
  {
    return;
  }
  if (type & this->ProcessType || type == vtkCommandOptions::EVERYBODY)
  {
    typedef vtksys::CommandLineArguments argT;
    this->Internals->CMD.AddArgument(longarg, argT::EQUAL_ARGUMENT, var, help);
    if (shortarg)
    {
      this->Internals->CMD.AddArgument(shortarg, argT::EQUAL_ARGUMENT, var, longarg);
    }
  }
}

//----------------------------------------------------------------------------
void vtkCommandOptions::AddArgument(
  const char* longarg, const char* shortarg, char** var, const char* help, int type)
{
  this->XMLParser->AddArgument(longarg, var, type);
  if (type & XMLONLY)
  {
    return;
  }
  if (type & this->ProcessType || type == vtkCommandOptions::EVERYBODY)
  {
    typedef vtksys::CommandLineArguments argT;
    this->Internals->CMD.AddArgument(longarg, argT::EQUAL_ARGUMENT, var, help);
    if (shortarg)
    {
      this->Internals->CMD.AddArgument(shortarg, argT::EQUAL_ARGUMENT, var, longarg);
    }
  }
}

//----------------------------------------------------------------------------
void vtkCommandOptions::AddCallback(const char* longarg, const char* shortarg,
  vtkCommandOptions::CallbackType callback, void* call_data, const char* help, int type)
{
  if (type & XMLONLY)
  {
    vtkErrorMacro("Callback arguments cannot be processed through XML.");
    return;
  }

  if (type & this->ProcessType || type == vtkCommandOptions::EVERYBODY)
  {
    typedef vtksys::CommandLineArguments argT;
    this->Internals->CMD.AddCallback(longarg, argT::EQUAL_ARGUMENT, callback, call_data, help);
    if (shortarg)
    {
      this->Internals->CMD.AddCallback(
        shortarg, argT::EQUAL_ARGUMENT, callback, call_data, longarg);
    }
  }
}

//----------------------------------------------------------------------------
int vtkCommandOptions::UnknownArgumentHandler(const char* argument, void* call_data)
{
  vtkCommandOptions* self = static_cast<vtkCommandOptions*>(call_data);
  if (self)
  {
    self->SetUnknownArgument(argument);
    return self->WrongArgument(argument);
  }
  return 0;
}

//----------------------------------------------------------------------------
int vtkCommandOptions::DeprecatedArgumentHandler(const char* argument, const char*, void* call_data)
{
  // cout << "UnknownArgumentHandler: " << argument << endl;
  vtkCommandOptions* self = static_cast<vtkCommandOptions*>(call_data);
  if (self)
  {
    return self->DeprecatedArgument(argument);
  }
  return 0;
}

//----------------------------------------------------------------------------
void vtkCommandOptions::GetRemainingArguments(int* argc, char*** argv)
{
  *argc = this->Argc;
  *argv = this->Argv;
}

//----------------------------------------------------------------------------
int vtkCommandOptions::GetLastArgument()
{
  return this->Internals->CMD.GetLastArgument();
}

//----------------------------------------------------------------------------
void vtkCommandOptions::ComputeApplicationPath()
{
  this->SetApplicationPath(nullptr);

  std::string argv0 = this->GetArgv0();
  if (!argv0.empty())
  {
    if (argv0.rfind('/') != std::string::npos || argv0.rfind('\\') != std::string::npos)
    {
      // is a relative/absolute path, compute it based on cwd
      argv0 = vtksys::SystemTools::CollapseFullPath(argv0);
    }
    else
    {
      // no path separator found, search PATH for it
      argv0 = vtksys::SystemTools::FindProgram(argv0.c_str());
    }
    this->SetApplicationPath(argv0.c_str());
  }
}

//----------------------------------------------------------------------------
void vtkCommandOptions::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "XMLConfigFile: " << (this->XMLConfigFile ? this->XMLConfigFile : "(none)")
     << endl;
  os << indent << "UnknownArgument: " << (this->UnknownArgument ? this->UnknownArgument : "(none)")
     << endl;
  os << indent << "ErrorMessage: " << (this->ErrorMessage ? this->ErrorMessage : "(none)") << endl;
  os << indent << "HelpSelected: " << this->HelpSelected << endl;
  os << indent << "ApplicationPath: " << (this->ApplicationPath ? this->ApplicationPath : "(none)")
     << endl;
}
